Because if a storyteller is doing his job, he makes you care. And if that storyteller then says "I dunno, then they stopped fighting, I guess," without any explanation or clarification, his audience has every right to be pissed off. Because they were given reason to stay interested, reason to keep up with his tale, only to be shut down just as things were getting good. A waste of time, a waste of emotional tension, a waste, if you fail to grasp the significance of narrative, of money.